Ukraine used an all-robot force to capture a Russian enemy position, marking the first time in the war such an operation has been successfully executed, Ukrainian President Volodymyr Zelensky announced on Monday. 

Russian troops surrendered their position after Ukraine used only aerial drones and ground robots, Zelensky said during a speech to weapons manufacturers on Ukraine’s Arms Makers’ Day. The development is crucial in a five-year war that some analysts believe could cost 2 million soldiers on both sides of the conflict their lives by the spring’s end.